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A reveler is pushed by a Torrestrella ranch bull at the bull ring at the end of the fifth running of the bulls, at the San Fermin fiestas, in Pamplona Spain, July 11, 2013.

People from around the world arrive to Pamplona every year to take part in the eight-day event glorified by Ernest Hemingway's 1926 novel "The Sun Also Rises."

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The horse of Spanish mounted bullfighter Pablo Hermoso de Mendoza faces off with a bull during a bullfight at the San Fermin Fiestas in Pamplona, July 6, 2013.

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A cow jumps over revelers lying in a bull ring at the end of the fifth run of the San Fermin festival, July 11, 2013.

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A runner is gored by an "El Pilar" fighting bull during the running of the bulls at the San Fermin festival, July 12, 2013.

An American and two Spaniards were gored Friday during the danger-filled sixth bull run of Spain's San Fermin festival.

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Spanish bullfighter David Mora, left, prepares with assistants before entering the bullring at the San Fermin fiestas in Pamplona, July 11, 2013.

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Steers run after Torrestrella's ranch fighting bulls at Calle Mercaderes during the sixth day of the San Fermin festival, July 11, 2013.

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A fighting bull jumps during the San Fermin festival in Pamplona, July 8, 2013.

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People on balconies watch participants running in front of bulls during the fifth bull run of the San Fermin Festival, July 11, 2013.

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Revelers run in front of a fighting bull during the San Fermin fiestas, July 9, 2013.

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Spanish bullfighter David Mora, left, prepares with assistants before entering the bullring at the San Fermin fiestas, July 11, 2013.

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Spanish bullfighter Ivan Fandino, is gored by a Torrestrella ranch bull at the San Fermin fiestas, July 11, 2013.

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A fighting bull charges a reveler during the running of the bulls at the San Fermin festival, July 12, 2013.

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Revelers participate in the second running of the bulls at the San Fermin fiestas in Pamplona, northern Spain, July 8, 2013.

The early morning race saw thrill-seekers dashing alongside six fighting bulls and six bell-tinkling steers that try to keep the beasts together along the narrow 930-yard course from a holding pen to the city bull ring. It lasted just over two minutes. The run is televised nationally and is the highlight of the nine-day street partying festival.

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Revelers face a fighting bull during the running of the bulls of the San Fermin festival in Pamplona, July 7, 2013.

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Revelers wait on balconies before the start of the first running of Alcurrucen ranch fighting bulls, July 7, 2013.

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A reveler runs next to a fighting bull, July 7, 2013.

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Revelers run in front of fighting bulls in Pamplona, July 8, 2013.

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Bullfighters warm up before a fight during the San Fermin festival in Pamplona, July 7, 2013.

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A fighting bull looks at a pink capote during a bullfight in Pamplona, July 7, 2013.

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Revelers wait for the running of the bulls during the San Fermin festival, July 8, 2013.

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Revelers wait in the early morning before the start of the first running of the bulls in Pamplona, July 7, 2013.

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Revelers run alongside fighting bulls during the second running of the bulls, July 8, 2013.

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A fighting bull is seen during a bullfight in Pamplona, July 7, 2013.

Credit: Daniel Ochoa de Olza/AP

A fighting bull runs towards revelers during the running of the bulls in Pamplona, July 7, 2013.

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Spanish bullfighter Antonio Nazare performs with an Alcurrucen fighting bull during a bullfight in Pamplona, July 7, 2013.

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A reveler with a tattoo of a bull on his right arm, smiles as he waits for the second running of the bulls in Pamplona, July 8, 2013.